I read! Definitely. If I don't feel like writing or producing anything, a good fic is enough to give me the feels again :) (Or sign up for random challenges for that adrenaline rush.)

I saw what praevarus said about writing by hand, and I do find that it works for me too! If I'm blocked on the computer, I try to change my medium of writing (sometimes that means changing a writing programme, or writing on an entirely blank page -- something that shakes it up a bit).